Carsten Lutz Ulrike Sattler Lidia Tendera The Complexity of Finite Model Reasoning in Description Logics. 60-74 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2741&spage=60 2003 conf/cade/2003 CADE db/conf/cade/cade2003.html#LutzST03